Corey, Gerald, author
Brooks/Cole Cengage Learning, 2013
Buku Teks
Corey, Gerald, author
Brooks/Cole , 2001
Buku Teks
Corey, Gerald, author
Brooks/Cole , 2013
Buku Teks
Arbuckle, Dugald S., author
Allyn and Bacon, 1961
Buku Teks
Hansen, James C., author
Allyn and Bacon , 1986
Buku Teks